Recording sheets for ink jet printing

Abstract

A recording sheet for ink jet printing comprising a support having coated onto said support at least one ink receiving layer and a gelatin containing absorption layer, characterized in that the absorption layer is situated between the support and the ink receiving layer and that it comprises a micelle forming compound selected fromsalts of branched or unbranched alkyl sulfates of formula CnH2n+1OSO3H, wherein n is from 5 to 25;salts of branched or unbranched alkyl phosphates of formula CnH2n+1OPO3H2, wherein n is from 5 to 25;substituted phenols of general formula (I) wherein n is from 18 to 50;or salts of substituted phenols of general formula (II) wherein n is from 5 to 55.

What is claimed is:  
     
       1. A recording sheet for ink jet printing comprising a support having coated onto said support at least one ink receiving layer and, between the support and the ink receiving layer, a gelatin or substituted gelatin containing absorption layer, characterized in that the absorption layer comprises a micelle forming compound selected from 
       salts of branched or unbranched alkyl sulfates of formula C n H 2n+1 OSO 3 H, wherein n is from 5 to 25;  
       salts of branched or unbranched alkyl phosphates of formula C n H 2n+1 OPO 3 H 2 , wherein n is from 5 to 25;  
       substituted phenols of general formula (I)                    
        wherein n is from 18 to 50;  
       or salts of substituted phenols of general formula (II)                    
        wherein n is from 5 to 55; and  
       wherein said micelle forming compound is present in an amount of at least 20 weight percent relative to gelatin and said ink receiving layer consists of a binder and at least one material selected from the group consisting of dye fixing agents, crosslinking agents, defoamers and pH regulating agents.  
     
     
       2. A recording sheet according to  claim 1  characterized in that the absorption layer comprises as micelle forming compound unbranched alkyl sulfates of formula C n H 2n+1 OSO 3 H, wherein n is from 5 to 25, or unbranched alkyl phosphates of formula C n H 2n+1 OPO 3 H 2 , wherein n is from 5 to 25. 
     
     
       3. A recording sheet according to  claim 1  characterized in that the absorption layer comprises as micelle forming compound unbranched alkyl sulfates of formula C n H 2n+1 OSO 3 H, wherein n is from 8 to 16. 
     
     
       4. A recording sheet according to  claim 3  characterized in that the absorption layer comprises as micelle forming compound the alkyl sulfate of formula C 12 H 25 OSO 3   − M + , wherein M is a metal cation selected from Na, K, Mg/2, Ca/2, Ba/2, La/3. 
     
     
       5. A recording sheet according to  claim 1  characterized in that the absorption layer comprises the micelle forming compound in a quantity of 10 to 50 weight percent relative to gelatin. 
     
     
       6. A recording sheet according to  claim 1  characterized in that the absorption layer comprises the micelle forming compound in a quantity of 15 to 45 weight percent relative to gelatin. 
     
     
       7. A recording sheet according to  claim 1  characterized in that the absorption layer comprises the micelle forming compound in a quantity of 20 to 40 weight percent relative to gelatin. 
     
     
       8. A recording sheet according to  claim 1  characterized in that the absorption layer has a dry thickness from 3 μm to 20 μm. 
     
     
       9. A recording sheet according to  claim 1  characterized in that the gelatin is a limed bone gelatin.